The Positive Behavior Support triangle is a way of looking at behaviors within your school.  Typically, 80% of students fall within the green zone, which means that they receive less than one referral all year.  Typically, 15% of all students fall into the yellow zone, which means they need some intervention to try to put them back into the green zone.  5% of students at most schools fall into the red zone, which flags them for intense intervention.